at master's side;
---------------------

zone "lslhr.com" {
        type master;
        notify no;
        file "lslhr.com";
        allow-transfer { localhost; 192.168.0.18; };
};


at slave (192.168.0.18) side;
------------------------------

zone "lslhr.com" {
        type slave;
        notify no;
        file "lslhr.com";
        masters { 192.168.0.17; };
        allow-transfer { none; };
};